linux-kernel - Re: [PATCH v11 4/6] ARM: dts: imx6q-evi: support altera-ps-spi

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Date:   Fri, 2 Jun 2017 21:54:22 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     stillcompiling@...il.com
Cc:     Rob Herring <robh+dt@...nel.org>, Alan Tull <atull@...nel.org>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Anatolij Gustschin <agust@...x.de>,
        Bastian Stender <bst@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-fpga@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v11 4/6] ARM: dts: imx6q-evi: support altera-ps-spi

Am 02.06.2017 um 21:39 schrieb stillcompiling@...il.com:
> On Friday, June 2, 2017 6:30:12 PM PDT Andreas Färber wrote:
>> Am 25.05.2017 um 19:29 schrieb Joshua Clayton:
>>> diff --git a/arch/arm/boot/dts/imx6q-evi.dts
>>> b/arch/arm/boot/dts/imx6q-evi.dts index 24fe093a66db..a0cbb2d84803 100644
>>> --- a/arch/arm/boot/dts/imx6q-evi.dts
>>> +++ b/arch/arm/boot/dts/imx6q-evi.dts
>>> @@ -82,6 +82,15 @@
>>>
>>>  	pinctrl-names = "default";
>>>  	pinctrl-0 = <&pinctrl_ecspi1 &pinctrl_ecspi1cs>;
>>>  	status = "okay";
>>>
>>> +
>>> +	fpga_spi: cyclonespi@0 {
>>
>> "cyclonespi" does not strike me as the best node name.
>>
>> I am guessing this is a sub-node of a SPI controller node, so no need to
>> repeat "spi", and Cyclone seems more or less implied by "altr,fpga-".
> True.
>>
>> Note that the example in the bindings doc uses "evi-fpga-spi". Nodes
>> don't need to be (shouldn't be?) prefixed with the board. Note that
>> bindings examples tend to get copied a lot.
>>
>> Any reason not to just use "fpga@0" in both places for simplicity?
> Sure. fpga: fpga@0 is probably better.

Note that I was only commenting on the node name, the latter part.

I'm not aware of any rules for the label, so that could remain unchanged
or adopt cyclone_spi from the old node name or whatever is unique and
syntactically valid.

> I'll change it in both the dts and the binding doc.

Thanks. Maybe double-check if there's any conventions Xilinx/Lattice DTs
are using.

Cheers,
Andreas

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